人民长江2024，Vol.55Issue(1)：1-5,20,6.DOI:10.16232/j.cnki.1001-4179.2024.01.001
长江-鄱阳湖顶托作用评价指标研究
Characterization index of jacking effect between Changjiang River and Poyang Lake
摘要
Abstract
There are complex riverbed evolution and material-energy exchange in the river-lake confluence system formed by the Changjiang River and Poyang Lake.The complicated converge jacking effect between Changjiang River and Poyang Lake is an important factor determining the water exchange between the river and lake,which influences the water resources,flood control,ir-rigation,navigation and ecology of the Poyang Lake.We established an index system for assessing the jacking effect strength of Changjiang River and Poyang Lake from the basic equation of momentum,and propose a index of jacking angle(R).The results show that there is no trend change of R since 1980s,indicating that the jacking effect strength of Changjiang River and Poyang Lake has not changed obviously after the storage of Three Gorges Reservoir.However,from the intra-annual variation,the jacking effect strength is obviously enhanced due to the replenishment effect of Three Gorges Reservoir in dry period.On the contrary,the jacking effect strength is weakened due to abatement of the flood peak during the flood season and impoundment at the end of flood season.The change of the jacking effect will cause more water to stay in the lake during April to June,which is prone to ba-sin flooding.While the jacking effect accelerate the lake water into the river during July to October,which makes the low-water level situation of Poyang Lake continue to deteriorate.The research results can provide reference for the governance and protection of the Changjiang River and Poyang Lake.关键词
江湖关系/顶托作用/顶托角/三峡水库/鄱阳湖/长江Key words
river-lake relationship/jacking effect/jacking angle/Three Gorges Reservoir/Poyang Lake/Changjiang River分类
建筑与水利引用本文复制引用
陈璐,邓金运..长江-鄱阳湖顶托作用评价指标研究[J].人民长江,2024,55(1):1-5,20,6.基金项目
国家重点研发计划项目(2021YFC3000102) （2021YFC3000102）
长江勘测规划设计研究有限责任公司自主创新项目(CX2021Z03) （CX2021Z03）
国家自然科学基金青年科学基金项目"基于河湖水文-水动力耦合模型的湄公河与洞里萨湖水量交换关系与水文情势驱动响应关系定量图谱研究"(52009079) （52009079）
